DataBind HDFS Data to the DevExpress Data Grid

The ADO.NET Provider for HDFS by CData incorporates conventional ADO.NET data access components compatible with third-party controls. You can adhere to the standard ADO.NET data binding procedures to establish two-way access to real-time data through UI controls. This article will demonstrate the utilization of CData components for data binding with DevExpress UI Controls (Windows Forms and Web controls), specifically binding to a chart that visualizes live data.

In order to authenticate, set the following connection properties:

• Host: Set this value to the host of your HDFS installation.
• Port: Set this value to the port of your HDFS installation. Default port: 50070

Windows Forms Controls

The code below shows how to populate a DevExpress chart with HDFS data. The HDFSDataAdapter binds to the Series property of the chart control. The Diagram property of the control defines the x- and y-axes as the column names.

using (HDFSConnection connection = new HDFSConnection(
"Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;User=root;")) {
  HDFSDataAdapter dataAdapter = new HDFSDataAdapter(
  "SELECT FileId, ChildrenNum FROM Files WHERE FileId = '119116'", connection);
  
  DataTable table = new DataTable();
  dataAdapter.Fill(table);
  DevExpress.XtraCharts.Series series = new DevExpress.XtraCharts.Series();
  chartControl1.Series.Add(series);
  series.DataSource = table;
  series.ValueDataMembers.AddRange(new string[] { "ChildrenNum" });
  series.ArgumentScaleType = DevExpress.XtraCharts.ScaleType.Qualitative;
  series.ArgumentDataMember = "FileId";
  series.ValueScaleType = DevExpress.XtraCharts.ScaleType.Numerical;
  chartControl1.Legend.Visibility = DevExpress.Utils.DefaultBoolean.False;
  ((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true;                              
}

Web Controls

The code below shows how to populate a DevExpress Web control with HDFS data. The HDFSDataAdapter binds to the Series property of the chart; the Diagram property defines the x- and y-axes as the column names.

using DevExpress.XtraCharts;

using (HDFSConnection connection = new HDFSConnection(
"Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;User=root;"))
{
  HDFSDataAdapter HDFSDataAdapter1 = new HDFSDataAdapter("SELECT FileId, ChildrenNum FROM Files WHERE FileId = '119116'", connection);
  DataTable table = new DataTable();
  HDFSDataAdapter1.Fill(table);
  DevExpress.XtraCharts.Series series = new Series("Series1", ViewType.Bar);
  WebChartControl1.Series.Add(series);
  series.DataSource = table;
  series.ValueDataMembers.AddRange(new string[] { "ChildrenNum" });
  series.ArgumentScaleType = ScaleType.Qualitative;
  series.ArgumentDataMember = "FileId";
  series.ValueScaleType = ScaleType.Numerical;
  ((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true;
}